To provide a device to treat ambient air by adding a substance to emit a fragrance.

This device has a housing 1, an air inlet opening 2, and an air outlet opening 3, and in the housing, an electric ventilator 4 which generates an air stream circulating in the housing 1 is arranged. In order to house a fragrant substance 14, a partial housing 9 is arranged in the device housing 1, and the partial housing has a lid, a door, or a flap device 11 which can be operated from the outside of the device housing 1, and by this method, the substance which generates a fragrance, existing as a solid body as much as possible, can be inserted comfortably in the partial housing 9, and also, can be taken out from the partial housing 9. The partial housing 9 is constituted and arranged in such a manner that a small part of the air rotated from the electric ventilator 4 may be circulated through the partial housing 9.